Oil pump



' .Dec. 8, 1931. G. DUFFING I 1,335,351

OIL PUMP Filed April 26, 1928 f Patented Dec. 1931 UNITED STATES PATENT OFFICE GEO'RG DUFFIN G, OF HAMBURG, GERMANY OITJ PUMP Application filed April 26, 1928, Serial No. 273,111, antIin Germany May 6, 1927.

This invention relates to the lubrication of journal bearings and more particularly of car axles.

, One of the objects of the invention is to simplify the construction of the pumping mechanism and to simplify the driving connection for such devices.

Another object of the invention is to provide a construction comprising few parts and also a construction which may be easily and quickly detached from the journal, taken apart and reassembled.

The principal object of the. invention is vfinally to have a full lubrication when the journal is rotating in the. forward direction and likewise in the reverse direction.

The following description in connection with the drawings which form a part of this application, will give an understanding of the invention.

Fi ure 1 is a transverse section taken on line S of Fig. 2;

Figure 2 is a transverse section rectangular to the axle taken on line T-V of Fig. 1;

Figure 3 is a horizontal transverse section taken on line L--M of Fig. 2;

Figure 4 is a view in vertical section of the casing for the pumping mechanism showing a modification of the delivery openings;

Figure 5 is a schematic view illustrating the operation of the device.

The pumping mechanism consisting of the gears 1, 2 and 3 is mounted in the casing 4 with the cover 5, the primary gear 3 mesh- 3 ing with the idler gears 1 and 2. The gear 3 is positively driven by the projection 6 of the 'ournal to be lubricated.

hen the gear 3 is rotating in the clockwise sense as in Fig. 2, then the conduit a is a suction space, the conduit 6 is a pressure space and the conduit 0 is a delivery space. The

pipes A and B are in connection with a supply "tank or reservoir (not shown) and the pipes C and D extend close by the surface of the journal (Fig. 1). The oil coming from the suction pipe A'flows partly to 0 and the delivery pipe C; and the remaining part, driven to b by the gear 3, flows to .the supply tank throu hvthe pipe B. The air coming from pipe l) escapes through B. The flow of the oil corresponds, to the scheme as shown in Fig. 5.

The exhaust chambers are bounded partly by the periphery of the primary gear, partly by the periphery ofone idler gear and part- 1y by the wall of the casing common to both exhaust chambers, thus allowing an easy switching from every exhaust chamber to a common exhaust passage by the ai of a. movable-pivoted web, only effected by the w exhaust pressure and not sensible against impurities of the liquid.

When the gear 3 is rotating in the anti-- clockwise sense, then pipe B in Fig. 2 constitutes'a suction pipe and D constitutes a de- 5 livery pipe.

The gear 3 is fixed to the projection 6 of the journal to be lubricated by the screw 7. The pump casing, (4, 5 Fig. 1)- rides on the hub of the gear 3 and is prevented from rotation by projections 9 propping against the Walls of the axle box or the like. The entire apparatus, however, is supported by the journal only. I

A modification of theapparatus isshown in F i 4 according to which the spaces 0 and of Fig. 2 are united and connected with one delivery 0 ening only. The valve 8 provides for the elivery of the whole of the oil discharged by the gears 3-1 or 32 at their meshing point goes to the delivery I opening.

Having-described my invention, what I claim and desire to secure by Letters Patent Lubricant pumping mechanism comprising, in combination a pump casing having a positively driven primary gear arran ed therein, idler gears meshing with the rst mentioned gear, intake chambers bounded by the wall of the casing and the peripheries of the positively drlven gear and one idler gear and exhaust chambers bound part- I 1y b the periphery of the primary gear, 'part y by t e periphe of one idler gear and partly by the wa of the casing, a pivoted web boundin the two exhaust chambers and adapte to ensure an easy switching from every exhaust chamber to a 1 common exhaust passage, whereby the lubricant may be driven out in the same sense independently of the sense of rotation of the primary gear.

In testimony whereof I aflix my signature.

GEORG DUFFING. 

